I know the default page size of a 32-bit process running on 32-bit Windows is 4K, whereas that of a 64-bit process running on 64-bit Windows is 8K. However, what is the actual page size of a 32-bit process running on 64-bit Windows (i.e. WOW64) ? 4K? 8K?
The page size is still 4K - 1M pages at 4GB maximum addressable RAM memory
Virtual memory size. On the Intel Itanium processor, WOW64 adds significant overhead if two or more instances of the same 32-bit application are running concurrently. This is due to the native 8 KB pages on the Intel Itanium, which complicates the emulation of the native 4 KB pages on the x86 architecture (more pages are marked as writable; all writable pages are private to the process). This can adversely affect the scalability of Terminal Services on certain processors. This is not the case for the x64 processor.